Based on Bhagavad Gita Chapter 16, Text 09
The Bhagavad-gita (16.09) indicates that the atheistic, being possessed by their meager intelligence, flourish in self-destructive and world-destructive activities. In these people, ignorance not only resides, but flies with the wings of the misdirected intellect
To be in ignorance is bad; these are the wingless atheists.
To be in ignorance and to imagine oneself to be in knowledge is worse; these are the budding wing atheists.
To be in ignorance, to imagine oneself to be in knowledge and to imagine one in knowledge to be in ignorance is worst; these are the flying atheists, who aggressively proselytize for their religion of disbelief.
This third category is where fanatical atheists belong. These intolerant devotees of atheism baptize themselves as the saints of reason and strut with a holier-than-thou attitude of condescension towards anyone who doesn’t agree with their belief in disbelief.